Compress Image

An image compressor reduces the file size of a JPG, PNG, WebP, or GIF image by re-encoding it at a lower quality setting or converting to a more efficient format, with the goal of shrinking the file while keeping it visually acceptable. VisualDocs uses the browser's native Canvas API to do this entirely client-side — your images are never uploaded to a server, so there is no privacy concern and no upload wait. You can keep the original format or switch to WebP for 25 to 35 percent better compression than JPEG at the same perceived quality.

Compression is the single highest-impact optimization for websites and apps: a 1 MB hero photo compressed to 200 KB loads far faster, cuts bandwidth costs, and improves your Core Web Vitals scores — which in turn helps SEO and search ranking. For most web uses, 80 percent quality is the sweet spot: visually lossless to the human eye but 60 to 80 percent smaller than the original. For email or social, 70 percent is fine; for print, stay at 90 percent or above to preserve detail.

The tool supports files up to 50 MB and lets you tune quality with a slider and choose the output format, so you can balance size against quality for each specific use case. PNG compression is lossless, so it is the right choice when you need transparency or pixel-perfect detail without any quality loss at all, while JPEG and WebP are the formats for photographs where small file size matters most.

The Canvas API re-encodes by drawing the image to an offscreen canvas and calling toBlob or toDataURL with your chosen quality parameter, which maps to the browser's internal JPEG or WebP encoder, so results are consistent across Chromium and Firefox even though the underlying codec differs. PNG output always passes through a lossless deflate step, meaning a PNG re-exported at 100 percent quality will not grow larger than the source and may actually shrink if the original had inefficient compression. Because the entire pipeline runs client-side, there is no server round-trip latency, so compressing a folder of twenty product photos takes only a few seconds total and your originals never touch a network you do not control.